Предмет: Геометрия, автор: Аноним

помогите пожалуйста решить геометрию ,подробно ​

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Ответы

Автор ответа: ludmilaksenija2005
1

Объяснение:

13.

ABCD - ромб.

В ромбе диагонали пересекаются под прямым углом и точкой пересечения делятся пополам.

по теореме Пифагора:

АС/2=√(ВС²-(ВD/2)²)=√(10²-(12/2)²)=

=√(100-36)=√64=8

AC=2•8=16

ответ: х=16

14.

∆MNK:

MK²=MN²+NK²

25²=7²+24²

625=49+576

625=625 , значит ∆МNK -прямоугольный,

∠МNK=90°.

NL=MN•NK/MK=7•24/25=6,72

ответ: х=6,72

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